Hi,
The best advice I could give
you is to tell
your mom to make an appointment to see
a dermatologist.This sounds like
a yeast infection and it should be treated.Don't worry,your skin condition has nothing to do with breast cancer.
Don't use any lotion that could make things worse.. Dry your skin very well after bathing,or showering.In the meantime,you could use an anti-fungal cream until you see the doctor okay?
Take care now..